/ Dictionary / Index U ultra vires: Meaning and Definition of Find definitions for: ul•tra vi•res Pronunciation: (ul"tru vī'rēz), [key] — Law. Law. beyond the legal power or authority of a corporation, corporate officer, etc. (opposed to intra vires). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ultraviolet filter ultravirus Related Content Daily Word Quiz: slough Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language